Got my 2.13 rev C today. No lines out of the box and under multiple lighting conditions. Have not had it long enough to judge anything else carefully. Got very lucky. Apple was willing to accept my 1.86 rev B return even though I was outside the 14 day limit by 3 days. I had no idea a refresh was coming so fast. Monday was not a good day for me! Today - very good.
Well, what display do those of you with line-free MBAs have. Under system preferences - displays - color - profile - click on second to last line and it will show info about display.
9c90 is the bad display.
I now have my fourth MBA. It has been stuck on the "create your account" page for 15 minutes twice!